Portable burglar-alarm.



H. B. BROADWELL.

PORTABLE BURGLAR ALARM.

APPLICATION FILED APR.27| 1915.

Patented Jan. 25, 1916.

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EHVEMTQR HARRY E3. BRORDWELL n Wrrwzssas HARRY n naoanwnnn, or srr.Louis, MISSOURI.

PORTABLE BURGLAR-ALARM.

Application filed April 27, 1915.

To all whom it may concern:

Be it known that I, HARRY B. BROADWELL', a citizen of the United States,and resident of St. Louis, Missouri, have invented certain new anduseful Improvements in Portable Burglar-Alarms, of which the followingis a specification containing a full, clear, and exact description,reference being had to the accompanying drawings, forming a part hereof.

My invention relates to an improved portable burglar alarm, and consistsin the novel construction hereinafter described and specificallydesignated in the appended claims.

The object of my invention is to construct a portable burglar alarmespecially designed for use by traveling men, but it may be permanentlyattached to the doors or windows of private residences, businesshouses,warehouses and the like, to give an alarm whenever the door or window issurreptitiously opened.

In the drawings: Figure 1 is a plan view of my portable burglar alarmdetached; and Fi 2 is a longitudinal section taken through a portion ofa door and its frame, with my improved burglar alarm attached thereto.

Referring by numerals to the accompanying drawings: 3 indicates a commonalarm bell, which in the present instance has upon its interior theusual spring driven train of gearing for vibrating the clapper wheneverthe contact device 1 is pressed inwardly by engagement of the dooror'window sash 5. The alarm bell 3 is mounted upon a bracket 6, which isadjustably secured by means of screws 7 to a base plate 8, which in turnis hinged at 9 to the outer end of an attaching plate 10. Said attachingplate 10 is provided with a series of prongs 11 which are punchedtherefrom so that they project at a right angle to the said attachingplate 10. In case it is desired to afliX my improved burglar alarmpermanently to the door or sash, the same may be done by insertingcommon screws through the holes 12 into the door frame or one of theopposing sash rails 13. Hinged at14c to the outer end of said base plate8 is a clamping plate 15, the purpose of which is to retain the saidbase plate 8 in alinement with said attaching plate 10 whenever the bellis placed in an operative position in the path of the door or sash, asshown in Fig. 2. The inner end of the said clamping plate 15 is securedto the attaching plate 10 by means of a suitable Specification ofLetters Patent.

Paten ed J n.- 2 16- Serial No. 24,364.

and the prongs 11 are forced into the said part 13 by the act of closingthe door uponv said attaching plate, or if the device is to bepermanently attached, suitable screws are passed through the screw holes12 into the part 13. The said contact device 4 will then be located inthe path of the door or sash 5 as it is opened, and will be contacted bysaid part 5 and ring the bell 3.

When the device is not in use, the base plate 8 and the clamping plate15, together with the bell 3, are swung around at right angles out ofthe path of the door or sash 5, as indicated by dotted lines in Fig. 2,so that the door or sash may be opened without causing the bell to ring.This is permitted by first releasing the clamping plate 15 from theattaching plate 10 by turning the flat head of the screw 16 so that itwill be located parallel with the said slot 17 in the said clampingplate'15, when the inner end of the said clamping plate may be quicklyswung outwardly, the said slotted portion of the said clamping platepassing by the said screw 16.

The bell 3 acts as a stop, to prevent the opening of the door, and insome cases the bell may be displaced by a common buzzer or any othercommon alarm.

I claim:

1. The improved portable burglar alarm, comprising an attaching platehaving means whereby it may be attached to a door or window sash, a baseplate hinged to the outer end of said attaching plate, a bell carried bysaid base plate, a contact connected to said bell and adapted to becontacted by the moving door or sash whenever the latter issurreptitiously opened, a clamping plate hinged to the outer end of saidbase plate, and a screw for securing said clamping plate to the saidattaching plate.

2. The improved portable burglar alarm,

comprising an attaching plate having means same when engaged by ELmoving door 01' In testimony whereof, I have sighed my sash, sald baseplate havlng a SGI'lQS of holes nametoethls spemficatwn, m-presenc'e oftwo 10 or slots thereln, screws for attaehmg salcl 1subscrlbmgwltnesses. I

bell to said base plate 'a clampin plate l hinged to the outer end ofsaid base plate HARRY BROADVVELL' and having an elongated slot, and aflat lVitnesses: headed screw for securlng sald clamplng- E. LPWALLAOE,

plate to the saiclettaching' plate. 1 v 1 1 JOHN C. HIGDON.

Copiesrof this patent may be obtained fer five cents each, b yaddressing the f Commissioner of Patents. 1 Washington, D. 0.? I

